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Wikipedia:

Photoresistor | light dependent resistor | LDR

a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. photoelectric or light sensing device are used in almost any branch of industry for control,safety,amusement and sound ... (33 of 516 words, 3 images)

Collins Dictionary:

photocell | photoelectric cell [synonym] | electric eye [synonym]

a device in which the photoelectric or photovoltaic effect or photoconductivity is used to produce a current or voltage when exposed to light or other ... (25 of 232 words, 1 usage example, pronunciation)